1998 calibration of Australian secondary standards of exposure and absorbed dose at (sup 60)Co

摘要

New calibration factors are reported for several of the ionization chambers maintained at the Australian Radiation Laboratory (ARL) and at the Australian Nuclear Science and Technology Organisation (ANSTO) as Australian secondary standards of exposure/air kerma and absorbed dose at (sup 60)Co. These calibration factors supplement or replace the calibration factors given in earlier reports. Updated (sup 90)Sr reference source data are given for the ARL chambers, and for two of the ANSTO chambers. These results confirm the stability of the secondary standards. A re-calibration of the ANSTO reference electrometer is reported. This was carried out using an improved method, which is fully described.